Implantable defibrillator event rates in patients with unexplained syncope and inducible sustained ventricular tachyarrhythmias: a comparison with patients known to have sustained ventricular tachycardia. - Andrews,N.P.; Fogel,R.I.; Pelargonio,G.; Evans,J.J.; Prystowsky,E.N. (J Am Coll Cardiol, 1999)